Remove parse_synom shim
diff --git a/src/path.rs b/src/path.rs
index 6baf35a..4cdf2de 100644
--- a/src/path.rs
+++ b/src/path.rs
@@ -296,7 +296,7 @@
             let content;
             Ok(ParenthesizedGenericArguments {
                 paren_token: parenthesized!(content in input),
-                inputs: content.parse_synom(Punctuated::parse_terminated)?,
+                inputs: content.parse_terminated(Type::parse)?,
                 output: input.call(ReturnType::without_plus)?,
             })
         }